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Retirement and Benefit Plans | 9 Months Ended
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Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Retirement and Benefit Plans | Retirement and Benefit Plans The following table presents the pension benefit costs:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2014 |  | 2013 |  | 2014 |  | 2013
| (thousands)
Service cost | $ | 433 |  |  | $ | 672 |  |  | $ | 1,248 |  |  | $ | 2,014 |
Interest cost | 5,050 |  |  | 4,667 |  |  | 15,130 |  |  | 13,959 |
Expected return on plan assets | (5,238 | ) |  | (5,025 | ) |  | (15,764 | ) |  | (14,807 | )
Amortization of actuarial (gain) loss | (5 | ) |  | 2,333 |  |  | (17 | ) |  | 6,870 |
Amortization of prior service costs | — |  |  | 23 |  |  | — |  |  | 68 |
Net periodic benefit cost | $ | 240 |  |  | $ | 2,670 |  |  | $ | 597 |  |  | $ | 8,104 |
In the first nine months of 2014, we contributed $11.7 million in cash to the pension plans. For the remainder of 2014, we expect to make approximately $0.4 million in additional cash contributions to the pension plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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